What human customs did the animals adopt to celebrate the Battle of the Cowshed? What is the purpose of these customs?

The Battle of the Cowshed occurs in chapter 4 of Animal Farm when Jones and a posse of men he has rounded up attempt to retake the farm from the animals. Snowball develops a strategy, having read up on the campaigns of Julius Caesar in a book Jones left in the farmhouse. When the humans are routed, the animals engage in several forms of celebration that are decidedly human in nature. They run up the flag of Animal Farm and sing "Beasts of England." They give a "solemn funeral" to the sheep that was killed in the battle. Snowball gives a rousing funeral oration as they bury their fallen comrade. Perhaps most significantly, they give decorations to those animals whose contributions were key to the victory. Snowball and Boxer are awarded "Animal Hero, First Class," and the dead sheep was awarded "Animal Hero, Second Class" posthumously. Later, they resolve to commemorate the battle each year by firing the gun that Jones left behind. Clearly, the animals are attempting to emphasize the collective nature of the struggle and are trying to establish patriotic rituals around which they can build a society. Orwell potentially intends these human behaviors to foreshadow the pigs' transformation later in the book, which is really underway already.